Enter a clue or pattern or both:
The Clue
Inner layers of some shells (6 letter answer)
The Answer
NACRES
Tags
Notes
The answer NACRES is rarely seen, appearing only about once every 2100 puzzles.
Related Clues
Button materials
Mother-of-pearls
Shell liners
Shellfish products
Nautilus shell liners
Definition
NACRE as a noun:
1. (mother-of-pearl, nacre) = the iridescent internal layer of a mollusk shell